The **MHR13TFJ-R** is a high-voltage resistor component typically used in television sets, monitors, and precision high-voltage power supplies. It belongs to the **MHR series** of thick-film metal oxide resistors, often utilized as a "Bleeder" or "Focus" resistor in CRT (Cathode Ray Tube) assemblies. --- ### 1. Technical Specifications The following table outlines the general characteristics of the MHR series components (specific to the TFJ-R variant): | Parameter | Specification | | :--- | :--- | | **Component Type** | High-Voltage Thick Film Resistor | | **Resistance Value** | Typically in the Range of $100\text{M}\Omega$ to $1\text{G}\Omega$ | | **Tolerance** | $\pm 5\%$ to $\pm 20\%$ (depending on specific sub-code) | | **Maximum Operating Voltage** | Up to $30\text{kV}$ DC | | **Construction** | Metal Oxide / Thick Film on Ceramic Substrate | | **Lead Finish** | Radial Leads (Tinned) | --- ### 2. Key Electronic Functions The MHR13TFJ-R serves several critical roles in high-voltage circuits: * **Voltage Division:** It is frequently used in focus-pack assemblies to divide the extreme anode voltage (from a Flyback Transformer) down to a lower voltage required for the focus and screen grids of a CRT. * **Safety Discharge (Bleeder):** It provides a discharge path for high-voltage capacitors when the device is powered off, preventing lethal shocks to technicians. * **Current Limiting:** Protects sensitive components by limiting the current flow in high-potential environments. --- ### 3. Physical Construction The part is designed to withstand extreme electrical stress and environmental factors: 1. **Ceramic Substrate:** Provides high dielectric strength to prevent arcing. 2. **Thick Film Coating:** A serpentine pattern of resistive material is screen-printed onto the ceramic to maximize the electrical path length. 3. **Epoxy Encapsulation:** The entire unit is usually coated in a high-insulation flame-retardant epoxy to protect against moisture and corona discharge. --- ### 4. Circuit Diagram Representation In a typical power supply or CRT circuit, it is represented as a high-value resistor or part of a multi-tap divider: ```text High Voltage In (e.g., 25kV) | [ R1: MHR13TFJ-R ] | +------> Focus Voltage Out (5kV - 8kV) | [ R2: Secondary Resistor ] | GND ```